Answer:
Cartridge A
Explanation:
The percentage of Ink Used for every cartridge is given by:

So, for Cartridge A:

Percentage = 32%
For Cartridge B:

Percentage = 56.25%
For Cartridge C:

Percentage = 33.33%
For Cartridge D:

Percentage = 35.42%
Finally, the cartridge that has 32% of its ink used is Cartridge A.